glibc/malloc-arena-get2.patch

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From 506e47da1d66b33e24440a495eeef85daf7f2a78 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed, 11 Oct 2023 13:43:56 -0300
Subject: [PATCH] malloc: Use __get_nprocs on arena_get2 (BZ 30945)
This restore the 2.33 semantic for arena_get2. It was changed by
11a02b035b46 to avoid arena_get2 call malloc (back when __get_nproc
was refactored to use an scratch_buffer - 903bc7dcc2acafc). The
__get_nproc was refactored over then and now it also avoid to call
malloc.
The 11a02b035b46 did not take in consideration any performance
implication, which should have been discussed properly. The
__get_nprocs_sched is still used as a fallback mechanism if procfs
and sysfs is not acessible.
Checked on x86_64-linux-gnu.
Reviewed-by: DJ Delorie <dj@redhat.com>
(cherry picked from commit 472894d2cfee5751b44c0aaa71ed87df81c8e62e)
---
include/sys/sysinfo.h | 4 ----
malloc/arena.c | 2 +-
misc/getsysstats.c | 6 ------
sysdeps/mach/getsysstats.c | 6 ------
sysdeps/unix/sysv/linux/getsysstats.c | 2 +-
5 files changed, 2 insertions(+), 18 deletions(-)
diff --git a/include/sys/sysinfo.h b/include/sys/sysinfo.h
index c490561581..65742b1036 100644
--- a/include/sys/sysinfo.h
+++ b/include/sys/sysinfo.h
@@ -14,10 +14,6 @@ libc_hidden_proto (__get_nprocs_conf)
extern int __get_nprocs (void);
libc_hidden_proto (__get_nprocs)
-/* Return the number of available processors which the process can
- be scheduled. */
-extern int __get_nprocs_sched (void) attribute_hidden;
-
/* Return number of physical pages of memory in the system. */
extern long int __get_phys_pages (void);
libc_hidden_proto (__get_phys_pages)
diff --git a/malloc/arena.c b/malloc/arena.c
index 6f03955ff2..82b09adb47 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -820,7 +820,7 @@ arena_get2 (size_t size, mstate avoid_arena)
narenas_limit = mp_.arena_max;
else if (narenas > mp_.arena_test)
{
- int n = __get_nprocs_sched ();
+ int n = __get_nprocs ();
if (n >= 1)
narenas_limit = NARENAS_FROM_NCORES (n);
diff --git a/misc/getsysstats.c b/misc/getsysstats.c
index 5f36adc0e8..23cc112074 100644
--- a/misc/getsysstats.c
+++ b/misc/getsysstats.c
@@ -44,12 +44,6 @@ weak_alias (__get_nprocs, get_nprocs)
link_warning (get_nprocs, "warning: get_nprocs will always return 1")
-int
-__get_nprocs_sched (void)
-{
- return 1;
-}
-
long int
__get_phys_pages (void)
{
diff --git a/sysdeps/mach/getsysstats.c b/sysdeps/mach/getsysstats.c
index 5184e5eee1..d3834f3b69 100644
--- a/sysdeps/mach/getsysstats.c
+++ b/sysdeps/mach/getsysstats.c
@@ -62,12 +62,6 @@ __get_nprocs (void)
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
-int
-__get_nprocs_sched (void)
-{
- return __get_nprocs ();
-}
-
/* Return the number of physical pages on the system. */
long int
__get_phys_pages (void)
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
index b0b6c154ac..1ea7f1f01f 100644
--- a/sysdeps/unix/sysv/linux/getsysstats.c
+++ b/sysdeps/unix/sysv/linux/getsysstats.c
@@ -29,7 +29,7 @@
#include <sys/sysinfo.h>
#include <sysdep.h>
-int
+static int
__get_nprocs_sched (void)
{
enum
--
2.44.0